On Wed, Dec 21, 2011 at 1:00 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote: > This patch is follow-up of Christohp Hellwig's work > [RFC: ->make_request support for virtio-blk]. > http://thread.gmane.org/gmane.linux.kernel/1199763 > > Quote from hch > "This patchset allows the virtio-blk driver to support much higher IOP > rates which can be driven out of modern PCI-e flash devices. At this > point it really is just a RFC due to various issues." Basic question to make sure I understood this series: does this patch bypass the guest I/O scheduler (but then you added custom batching code into virtio_blk.c)? If you're stumped by the performance perhaps compare blktraces of the request approach vs the bio approach. We're probably performing I/O more CPU-efficiently but the I/O pattern itself is worse. Stefan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
